基于水平支撑面摇摆与双测力平台测量的坐位平衡控制识别方法

文献信息

中文摘要

背景： 识别坐位平衡控制可能有助于估计时间延迟和评估前庭权重。然而，用于测量坐位身体运动或识别坐位平衡控制的实用方法很少。本研究旨在使用一种实用测量方法估计支撑面水平摇摆下坐位时上身质心（COM）位移，并为每个个体识别坐位平衡控制系统。方法：臀部和足部下方的两个测力平台与支撑面加速度计同步。在由低于1.50 Hz的多余弦波形组成的不可预测水平扰动下，使用包含延迟COM状态反馈和水平头部加速度反馈（后者代表耳石介导的水平头部加速度检测）的参数模型，在闭眼条件下识别平衡控制。结果：当与光学运动捕捉系统进行验证时（五名参与者），识别参数的平均相对误差小于5%。为期两天的重测信度测试（25名参与者）显示，四个识别参数的组内相关系数（ICC(1,1)）范围为0.57至0.73，表明中等可靠性。结论：即使在健康成人中，识别出的头部加速度反馈增益也可能指示头部加速度敏感性。

英文摘要

Identifying seated balance control may contribute to estimation of time delay and evaluation of vestibular weighting. However, few practical methods exist for measuring seated body motion or identifying seated balance control. This study aimed to estimate upper-body center of mass (COM) displacement during sitting under horizontal sway of the support surface using a practical measurement method and to identify a seated balance control system for each individual. Two force platforms under the buttocks and feet were synchronized with a support surface accelerometer. Under unpredictable horizontal perturbations composed of a multi-cosine waveform below 1.50 Hz, balance control was identified in an eyes-closed condition using a parametric model incorporating delayed COM state feedback and horizontal head acceleration feedback, the latter representing otolith-mediated detection of horizontal head acceleration. When validated against an optical motion capture system (five participants), the identified parameters exhibited an average relative error of less than 5%. A two-day reproducibility test (25 participants) yielded intraclass correlation coefficients (ICC(1,1)) of the four identified parameters ranging from 0.57 to 0.73, indicating moderate reliability. The identified head acceleration feedback gain may indicate head acceleration sensitivity, even among healthy adults.